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Jack Sangdahl

PROFILE

Jack Sangdahl

Worked extensively on the qmk/qmk_firmware repository, delivering 22 features and multiple architectural improvements over 10 months. Focused on embedded systems and firmware development, this work included migrating keyboard configurations to JSON, modernizing RGB LED control, and standardizing hardware interaction across diverse keyboard models. Leveraged C and Python to refactor drivers, enhance CLI tooling, and implement security best practices such as improved .gitignore handling. Prioritized maintainability by consolidating documentation, streamlining build and bootloader processes, and enforcing linting standards. These efforts improved onboarding, reduced configuration drift, and enabled more reliable, scalable firmware customization for both contributors and end users.

Overall Statistics

Feature vs Bugs

92%Features

Repository Contributions

57Total
Bugs
2
Commits
57
Features
22
Lines of code
45,539
Activity Months10

Work History

January 2026

1 Commits • 1 Features

Jan 1, 2026

January 2026 monthly summary for qmk/qmk_firmware: Implemented security hardening by adding .env and .envrc to .gitignore to prevent tracking of sensitive environment configuration files. This reduces risk of secrets exposure in forks and public clones, aligns with security best practices, and improves auditability of the repository. The change is recorded in commit ddeaa26fefa7b43a28ce583e39dbf43b7234dd24 and tied to PR #25904. No major bugs were reported this month; the focus was on strengthening security and codebase hygiene. Overall, improved security posture and traceability with clear, measurable business value.

November 2025

1 Commits • 1 Features

Nov 1, 2025

Monthly overview for 2025-11 focusing on enhancing documentation quality in qmk/qmk_firmware through a CLI linting enhancement. Delivered a Keyboard README Presence Check to enforce README.md presence for every keyboard, improving documentation compliance and error reporting in the CLI linting process. The change is tracked with a precise git commit linked to issue #25814 and thoroughly integrated with the existing lint workflow.

October 2025

4 Commits • 1 Features

Oct 1, 2025

October 2025: Delivered a comprehensive RGB configuration modernization for BM60HSRGB keyboards in qmk/qmk_firmware, replacing legacy RGBLight paths with a JSON-based keymap and a DD-based RGB Matrix driver, ensuring compatibility with a custom RGB Matrix implementation. The work removed conflicting RGBLight configurations, added safeguards to prevent simultaneous RGBLight and RGB Matrix usage, and migrated keymaps, defaults, and OLED code to stable, keyboard-scoped configurations. These changes improve reliability, reduce maintenance burden, and streamline customization for end users while aligning with future roadmap for BM60HSRGB family.

September 2025

27 Commits • 10 Features

Sep 1, 2025

2025-09 monthly summary for qmk/qmk_firmware: Delivered large-scale g_led_config migration to DD across 27 hardware variants and refactored external keyboard projects to align with the new DD-driven approach. This work improves configurability, consistency, and maintainability across the firmware family, enabling faster future iterations and reducing variant-specific drift. No explicit bug fixes are recorded for this period; the migration reduces risk of LED configuration drift and future maintenance burden.

August 2025

5 Commits • 2 Features

Aug 1, 2025

Monthly summary for 2025-08 focusing on qmk/qmk_firmware; delivered two major initiatives: unified keyboard configuration standardization with data-driven migrations, and Lotus58 build/bootloader simplification. The work included migrating keymaps to JSON, updating aliases, moving common settings to top-level, deprecating outdated configurations, and enhancing documentation to align with firmware standards. Also fixed a serial speed DD configuration during migrations. These changes reduce maintenance burden, improve consistency across keyboard families, and streamline builds and flashing for users. Technologies demonstrated include data-driven configuration design, JSON migrations, refactoring, alias management, build/bootloader consolidation, and documentation discipline.

July 2025

13 Commits • 4 Features

Jul 1, 2025

July 2025 monthly summary for qmk/qmk_firmware: Delivered broad modernization and standardization across Helix and Bastardkb keyboard families, expanded SPI-driven peripheral support, and improved developer onboarding through documentation upgrades. The work focused on maintainability, cross-board consistency, and faster feature delivery, with tangible config migrations and refactors across multiple repos.

April 2025

2 Commits

Apr 1, 2025

April 2025 monthly summary for qmk/qmk_firmware focusing on RGB Matrix keymap cleanup and bug fixes for Sofle and Beiwagon, consolidation of firmware revisions, and documentation cleanup. Delivered improvements reduce RGB Matrix coordinate errors, enhance cross-board consistency, and improve onboarding for contributors.

March 2025

2 Commits • 2 Features

Mar 1, 2025

Concise monthly summary for 2025-03 focusing on key architectural improvements and cross-model consistency in QMK firmware. Delivered two major features with associated bug fixes, improving hardware compatibility, reduce maintenance burden, and strengthening the GPIO API for future driver support.

January 2025

1 Commits

Jan 1, 2025

January 2025 monthly summary focusing on documentation quality and developer experience for the Mod Tap MT() macro in the srwi/qmk_firmware repository. Delivered a targeted documentation clarification to ensure the mod argument is described as PREFixed with MOD_ (not KC_), reducing misconfigurations and onboarding friction. The work was a single, scoped documentation fix with measurable business impact: improved accuracy, faster contributor onboarding, and reduced support questions.

December 2024

1 Commits • 1 Features

Dec 1, 2024

December 2024 — Delivered a UX-focused refactor of the qmk_firmware "new-keymap" prompt to simplify the keymap naming flow. The prompt text was streamlined and the unnecessary GitHub username field removed, centering on the keymap name. Commit 0228806ae8d1f12fc2c254b310c73076cfbde0d5 ("Change `new-keymap` keymap name prompt (#24701)" ). This reduces user friction, accelerates keymap creation, and improves onboarding for new users.

Activity

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Quality Metrics

Correctness92.0%
Maintainability87.2%
Architecture91.0%
Performance83.0%
AI Usage24.6%

Skills & Technologies

Programming Languages

CHJSONHjsonJSONJSON SchemaMakefileMarkdownPythonplaintext

Technical Skills

C ProgrammingC programmingCLI DevelopmentConfiguration ManagementDocumentationDriver DevelopmentEmbedded SystemsFirmware DevelopmentHardware ConfigurationHardware InteractionJSON configurationKeyboard ConfigurationKeyboard CustomizationKeyboard FirmwareLinting Tools

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

qmk/qmk_firmware

Mar 2025 Jan 2026
8 Months active

Languages Used

CHjsonJSONMakefileMarkdownJSON SchemaPythonHJSON

Technical Skills

Configuration ManagementDriver DevelopmentEmbedded SystemsFirmware DevelopmentHardware InteractionKeyboard Customization

srwi/qmk_firmware

Dec 2024 Jan 2025
2 Months active

Languages Used

PythonMarkdown

Technical Skills

CLI DevelopmentPythonDocumentation